Sunan an-Nasa'i 1669
سنن النسائي#1669SahihIt was narrated that Ibn Umar said:"I heard the Messenger of Allah (ﷺ) on the minbar, when he was asked about prayers at night, say: "Two by two, then if you fear that dawn will come, pray witr with one rak'ah
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
In-book reference: 20:72